The use of polycarbonate containing semipermeable membranes in the separation of gases

An improved gas separation membrane comprises a thin discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to formula I wherein R at each occurrence is independently H, Cl, Br, or C1-C4 alkyl and R is -CO-, -S-, -SO2-, -O-, a C1-C6 divalent hydro...

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Bibliographic Details
Main Authors BALES, STEPHEN E, JEANES, THOMAS O, FEAY, DARRELL C, ANADA, JOGINDER N
Format Patent
LanguageEnglish
French
German
Published 21.10.1987
Edition4
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
NON-METALLIC ELEMENTS
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
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Summary:An improved gas separation membrane comprises a thin discriminating layer consisting predominantly of a carbonate polymer derived from a bisphenol corresponding to formula I wherein R at each occurrence is independently H, Cl, Br, or C1-C4 alkyl and R is -CO-, -S-, -SO2-, -O-, a C1-C6 divalent hydrocarbon radical, or a C1-C6 divalent fluorocarbon radical, or inertly substituted C1-C6 divalent hydrocarbon radical, with the proviso that at least 25 weight percent of the moieties derived from the bisphenol of formula I present in the discriminating layer bear R groups which are exclusively Br or Cl, said gas separation membrane exhibiting a separation factor for oxygen and nitrogen at the ambient temperature of at least 6.1. The membrane has particular application to separating oxygen from nitrogen, or a nitrogen-containing gas.
Bibliography:Application Number: EP19870303173